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Reduction of shock-wave data with mean-field potential approach
KTH, Superseded Departments, Materials Science and Engineering.
2002 (English)In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 92, no 11, 6616-6620 p.Article in journal (Refereed) Published
Abstract [en]

Based on ab initio calculated 0 K results for the assumed face- or body-centered-cubic ground state, the thermal volume expansion of the principal Hugoniot relative to the 300 K isotherm is calculated using the recently developed mean-field potential approach for Cu, Ta, Mo, Pt, and Au. Neglecting shock melting and phase dependence of the high-temperature equation of state, shock-reduced 300 K isotherms at pressures up to 1 TPa (10 Mbar) are derived for these metals by substracting the calculated thermal volume expansion from the experimental shock-wave data. This approach does not invoke any empirical assumptions regarding the Gruneisen parameters or heat capacities. The excellent agreement between such shock-reduced data and the normal standards or empirical reductions by other authors shows that the reduced results can be used as pressure standards for the widely employed static diamond-anvil-cell experiments.

Place, publisher, year, edition, pages
2002. Vol. 92, no 11, 6616-6620 p.
Keyword [en]
x-ray-diffraction, high-pressure, equation, state, compression, iron, gpa, al, mo, tantalum
URN: urn:nbn:se:kth:diva-22044DOI: 10.1063/1.1518781ISI: 000179206600035OAI: diva2:340742
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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Ahuja, RajeevJohansson, Börje
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